What types of problems can be solved using the greatest common factor?

Find the balance at the end of 4 years if 1000 is deposited at the rate of

Aiden buys two bags of chips at $1.09 each and a 20 ounce soda for $1.20 at the gas station. he knows that the state tax is 5.5. how much change will he receive from a $5 bill?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles